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H e avy metals (HMs) like cadmium, c o p p e r, z i n c, l e a d, o r m e rc u ry are env i ronmental pollutants inducing phy s i o l ogi c a l a l t e rations in plants such as growth re t a rd at i o n , m e m b ra n e d a m age, ch a n ges in enzyme activities or induction of ox i d at ive stress when their concentrations exceed an element spec i fic thre s h o l d. HM ions interact with SHand histidy l groups of enzymes and membrane pro t e i n s , leading to inact ivation of the pro t e i n s , cell damage and fi n a l ly cell deat h [1]. Howeve r, a number of plant phenotypes with incre a s e d resistance to HM ions have been isolated from locations that a re polluted with high concentrations of diffe rent metals. The phy s i o l ogical basis of the HM tolerance of these plants can be add ressed either to a reduced uptake of HM ions into the plant cells or to the development of metal-sequesteri n g m e chanisms within diffe rent cellular compartments. Some of these detox i fi c ation mechanisms in HM exposed plants are metal binding to the cell wa l l s , reduced tra n s p o rt across the m e m b ra n e s , a c t ive effl u x , p re c i p i t ation in va c u o l e s , The coupling of size-exclusion chromatography with ICP-MS is shown to be an attractive technique to study the binding of cadmium and copper by phy t o chelatins in plant cell suspension cultures incubated with these metals. Electrospray mass spectrometry enabled to identify the metal binding compounds: (γ-Glu-Cys)2Gly and (γ-Glu-Cys)2.

analusis

Application of high performance liquid chromatography - inductively coupled plasma mass spectrometry to the investigation of phytochelatin complexes and their role in heavy metal detoxification in plants